For me, I did the 'sudo Xorg -configure' command to get an xorg.conf, then 
adjusted it to have:
Section "Device"
        ...
        Driver      "radeon"
        Option      "AccelMethod" "EXA"
EndSection

-- 
(EXA and 32MB) certain windows drawn garbled when XAA is used
https://bugs.launchpad.net/bugs/426582
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